Depth Gauge, Water Level Gauge (Hundredths, Tenths, Teet), Heavy-Duty Ruler-Style Water Level Indicator, All-Weather Water Level Tool, Rust-Resistant, with Pre-Drilled Holes (4-8 Feet). Precision Depth & Water Level Gauge – Heavy-Duty, All-Weather Ruler with Mounting Kit Instantly Monitor Water Levels with Unmatched Clarity & Durability!